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The objective was to compare pregnancy rates and pregnancy losses in lactating dairy cows that were diagnosed not pregnant and re-inseminated following either the Ovsynch® or Heatsynch protocols. Also evaluated were the effects of stages of the estrous cycle, ovarian cysts and anestrus on pregnancy ...

Bartolome, J. A.; Silvestre, F. T.; Kamimura, S.; Arteche, A. C. M.; Melendez, P.; Kelbert, D.; McHale, J.; Swift, K.; Archbald, L. F.; Thatcher, W. W.
Elsevier, New York, USA
Theriogenology, 2005, 63, 6, pp 1617-1627